Heat, stretch, and hammer, and, maybe cut a vee-fillet or two and weld back when to dimension. Cut out any buckling this way. You really do need a fairly accurately flat slab and screw jacks to set the frame up and ensure accurate measurements. Engineer's levels are a big help but a couple of protractor sets can make do if proper levels are not available. Long straight edges and steel rules are almost essential. Not a difficult job if you have the facilities. Do you know a blacksmith?



 just did the same thing in reverse
				
				
				
				
					
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